CN115059437A - CO containing multiple impurities 2 Method for improving recovery ratio of exhausted gas reservoir and effectively sealing and storing exhausted gas reservoir - Google Patents
CO containing multiple impurities 2 Method for improving recovery ratio of exhausted gas reservoir and effectively sealing and storing exhausted gas reservoir Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
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- 230000008901 benefit Effects 0.000 abstract description 9
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a CO containing multi-element impurities 2 A method for increasing the recovery ratio of exhausted gas reservoir and effectively sealing it off includes (1) forming CO with low, medium and high impurity concentration 2 A gas; (2) calculated CO with impurities using SRK equation of state 2 A phase envelope of the gas; (3) establishing a depleted gas reservoir model, and acquiring production history data of the gas reservoir; (4) injecting CO into exhausted gas reservoir under different parameter conditions by using numerical simulation technology 2 Performing simulation calculation on all factors of the sealing performance, (5) respectively determining the CO injection of different factors to the exhausted gas reservoir by comparing simulation calculation results 2 The influence of the sealing performance is analyzed, and the influence of all factors on improving the carbon sealing of the exhausted gas reservoir is analyzedDegree of performance impact; (6) according to the analysis result, the measures and directions for improving the recovery ratio of the exhausted gas reservoir by the impurity-containing CO2 are clarified. The invention is helpful for reducing CO 2 The separation and purification cost is also beneficial to improving the recovery ratio of the gas reservoir, and the comprehensive benefits of carbon dioxide utilization and sealing can be obviously improved.
Description
Technical Field
The invention belongs to the technical field of carbon capture, and particularly relates to CO containing multiple impurities 2 A method for improving the recovery ratio of the exhausted gas reservoir and effectively sealing the exhausted gas reservoir.
Background
Carbon capture, utilization and sequestration (CCUS) in depleted gas reservoirs is an important strategy to reduce carbon dioxide emissions, and lack of economic incentives limits its large-scale application. Considering that the carbon capture and gas separation processes dominate the overall cost of the CCUS, to reduce costs and gain potential economic benefits, impurities (N) will be included 2 、O 2 、H 2 O、Ar、H 2 、H 2 S、SO 2 ) CO of 2 The method is applied to improving the gas reservoir recovery ratio (CSEGR) and carbon dioxide sequestration, and can accelerate the large-scale application of CCUS.
Thus, CO 2 Co-injection with impurity gases is a cost-effective CO 2 Sequestration strategy of CO captured from flue gas 2 Is the main source of the injected gas, its component N 2 、O 2 、H 2 O、Ar、H 2 、H 2 S、SO 2 Is a potential impurity to be mixed with CO 2 Co-injected into the ground. Thus, the impurity-containing gas (N) 2 、O 2 、H 2 O、Ar、H 2 、H 2 S、SO 2 ) CO of 2 Injection of depleted gas reservoirs to enhance recovery is of great importance to reduce overall costs and to accelerate the implementation of the CCUS.
Disclosure of Invention
The invention provides a method for separating CO containing impurities 2 Injecting exhausted gas reservoir to drive gas and improve recovery ratio and simultaneously realizing CO 2 And (4) geological sealing. In the commercial operation process of the CCUS technology, the key is to reduce the cost and improve the comprehensive benefit, so that the research on the non-pure CO 2 Injecting exhausted gas to reduce CO 2 The separation and purification cost is low, the gas reservoir recovery ratio is improved, and the comprehensive benefits of carbon dioxide utilization and sealing can be obviously improved.
The specific technical scheme is as follows:
CO containing multiple impurities 2 The method for improving the recovery ratio of the exhausted gas reservoir and effectively sealing the exhausted gas reservoir comprises the following steps:
(1) selecting CO containing impurity gases with different concentrations 2 Injecting a gas mixture of three different impurity concentrations to form CO with low, medium and high impurity concentrations 2 A gas;
(2) CO with impurities calculated using SRK equation of state 2 Phase complexation of the gas;
(3) establishing a depleted gas reservoir model, and acquiring production history data of the gas reservoir;
(4) injecting CO into exhausted gas reservoir under different parameter conditions by using numerical simulation technology 2 Performing analog calculation on all factors of the encapsulation performance; the parameters comprise injection rate, initial recovery ratio and critical concentration of impurity gas in the produced gas; exhaust reservoir CO injection 2 Various factors of the sealing performance include CO 2 Inventory, gas mole fraction in gas reservoir, CO 2 Sealing and storing the construction period;
(5) by comparing the simulation calculation results, the CO injection into the exhausted gas reservoir by different injection rates, initial recovery ratios and impurity gas critical concentrations in the produced gas are respectively determined 2 Analyzing the influence degree of each factor on improving the carbon sequestration performance of the exhausted gas reservoir;
(6) according to the analysis result, the measures and directions for improving the recovery ratio of the exhausted gas reservoir by the impurity-containing CO2 are clarified.
As a further preferable embodiment, CO having low, medium and high impurity concentrations in the step (1) 2 The gas comprises the following components in percentage by volume:
96％CO 2 +1％N 2 +1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 ；
85％CO 2 +10％N 2 +2％O 2 +1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 ；
75％CO 2 +15％N 2 +3％O 2 +4％H 2 O+1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 。
as a further preferable technical scheme, the establishing of the depleted gas reservoir model in the step (3) comprises the steps of obtaining or calculating the length, width and height, the reservoir porosity, the horizontal permeability and the vertical permeability, the irreducible water saturation and the well pattern injection and production mode in the gas reservoir model.
As a further preferable technical proposal, the CO containing impurities is injected in the step (4) 2 Before, pure CO with the volume of 5-20% of impurity gas is injected 2 (concentration of>99.99%) if 96% CO is sequestered 2 +1％N 2 +1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 Then 5% pure CO is injected in advance 2 If 85% CO is sealed 2 +10％N 2 +2％O 2 +1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 Then, 12% pure CO is injected in advance 2 If 75% CO is sealed 2 +15％N 2 +3％O 2 +4％H 2 O+1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 Then, 20% pure CO is injected in advance 2 。
In the injection of CO containing impurities 2 Before, injecting a certain amount of pure CO 2 With the aim of forming a pure CO 2 Slug, slow down CO containing impurities 2 Mixing with natural gas.
As a further preferable technical scheme, in the step (4), the influence of different injection rates is considered, other parameters are kept unchanged, a series of injection rates are set, and the CO of the exhausted gas reservoir is analyzed 2 Variation of injection rate to depleted gas reservoir CO 2 And (3) influence of the sequestration performance, and the influence degree of the injection rate on the sequestration performance is determined.
AsFurther preferably, in the step (4), the influence of the initial recovery ratio is considered, other parameters are kept unchanged, a series of initial recovery ratios are set, and the change of the initial recovery ratio of the exhausted gas reservoir on the CO of the exhausted gas reservoir is analyzed 2 And (3) influence of the sequestration performance, and the influence degree of the initial recovery on the sequestration performance is determined.
As a further preferable technical scheme, in the step (4), the influence of the critical concentration of the impurity gas in the produced gas is considered, other parameters are kept unchanged, a series of critical concentrations of the impurity gas are set, and the change of the critical concentration of the impurity gas on the CO in the exhausted gas reservoir is analyzed 2 The influence of the sealing performance is used for determining the influence degree of the critical concentration of the impurity gas on the sealing performance.
The first purpose of the invention is to provide CO containing impurities 2 An extraction method for improving the recovery ratio by injecting a depleted gas reservoir. To reduce costs and to obtain potential economic benefits, the use of a catalyst containing impurities (N) 2 、O 2 、H 2 O、Ar、H 2 、H 2 S、SO 2 ) CO of 2 The gas can greatly reduce the cost of gas separation and purification, and simultaneously, the exhausted gas reservoir is selected as CO 2 The sealing place can apply the impurity gas to improve the gas reservoir recovery ratio (CSEGR) of the exhausted gas reservoir, and finally more economic benefits are obtained.
The second purpose of the invention is to implant impurity (N) 2 、O 2 、H 2 O、Ar、H 2 、H 2 S、SO 2 ) CO of 2 Before purging and sealing, injecting 5-20% pure CO 2 For sequestering CO containing impurities 2 With natural gas.
The third purpose of the invention is to define a comprehensive index for comparing various exhausted gas reservoirs with CO injection 2 The performance in the scheme is good or bad, and the index is defined as:
in the formula: c CO2 Is CO 2 CO in the reservoir after the purging and sequestration operations 2 Concentration; Δ R is CO 2 Gas reservoir recovery efficiency is improved by gas displacement; t is the project period. The project cycle is the development of CO for one project 2 The time taken to drive off the gas to the end of the sequestration. Through a series of numerical simulation researches, the method can effectively guide or clarify the injection of CO containing impurities into the exhausted gas reservoir 2 Enhanced recovery, in turn, facilitates the onsite implementation of CSEGR production schemes by gas reservoir site engineers.
Compared with the prior art, the invention has the beneficial effects that:
1) the method for improving the recovery ratio of the depleted gas reservoir by injecting the impurity gas, provided by the invention, can realize the improvement of the recovery ratio of the depleted gas reservoir and can realize carbon sequestration. Due to CO 2 The capture and purification costs of (A) are dominant in the CCUS process, so that non-pure CO is used 2 Can greatly reduce the cost of gas separation and remove the impure CO 2 And the injection of the exhausted gas reservoir can improve the recovery ratio of the gas reservoir and obtain more economic benefits.
2) The invention can systematically analyze the injection rate, the initial recovery ratio and the critical concentration of the impurity gas in the produced gas to inject CO into the exhausted gas reservoir 2 The influence of the comprehensive indexes of the sequestration scheme is used for clearly injecting CO 2 The main factors for improving the recovery ratio of the exhausted gas reservoir provide better understanding for the influencing factors of the process, and can provide favorable technical support for carbon sequestration of the exhausted gas reservoir.
3) The invention injects CO containing impurities 2 Before, injecting a certain amount of pure CO 2 Can form a pure CO 2 Slug, slow down CO containing impurities 2 The natural gas is mixed with the natural gas, so that the gas displacement effect is improved, the recovery efficiency effect is improved, and the impurity concentration in the produced gas is reduced, so that the impurity separation cost of the produced gas is reduced, and more economic benefits are obtained.
4) The comprehensive index provided by the invention is used for evaluating and comparing CO injection of various exhausted gas reservoirs 2 The performance in the sealing scheme is good and bad, and CO is considered in the comprehensive index 2 The utilization efficiency of the sealed storage can better evaluate CO related to the enhanced recovery ratio of the exhausted gas reservoir 2 And (4) sealing and storing comprehensive performance.
Drawings
FIG. 1 shows CO at different injection rates in the examples 2 Sealing the storage quantity;
FIG. 2 is the CO in the reservoir gas after the end of purging and sequestration in the examples 2 A mole fraction;
FIG. 3 shows the time required for purging and sealing the gas and the enhanced recovery ratio at different injection rates in the examples;
FIG. 4 is a graph showing the comprehensive evaluation index at different injection rates in the examples.
Detailed Description
The embodiments of the present invention will be described with reference to the accompanying examples.
CO containing impurities 2 The method for improving the recovery ratio of the exhausted gas reservoir comprises the following steps:
(1) selecting CO containing impurity gases with different concentrations 2 Injecting a gas mixture of three different impurity concentrations to form CO with low, medium and high impurity concentrations 2 A gas; CO of low, medium and high impurity concentration 2 The gas comprises the following components in percentage by volume:
96％CO 2 +1％N 2 +1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 ；
85％CO 2 +10％N 2 +2％O 2 +1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 ；
75％CO 2 +15％N 2 +3％O 2 +4％H 2 O+1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 。
(2) CO with impurities calculated using SRK equation of state 2 A phase envelope of the gas;
(3) establishing a depleted gas reservoir model, and acquiring production history data of the gas reservoir; establishing the depleted gas reservoir model comprises the steps of obtaining or calculating the length, the width and the height of the gas reservoir model, the porosity of a reservoir, the horizontal permeability and the vertical permeability, the saturation of the irreducible water and the injection and production mode of a well pattern.
(4) Injecting CO into exhausted gas reservoir under different parameter conditions by using numerical simulation technology 2 Performing analog calculation on all factors of the encapsulation performance; the parameters comprise injection rate, initial recovery ratio and critical concentration of impurity gas in the produced gas; exhaust reservoir CO injection 2 Various factors of the sealing performance include CO 2 Inventory, gas mole fraction in gas reservoir, CO 2 Sealing and storing for a period;
specifically, the method comprises the following steps:
considering the influence of different injection rates, keeping other parameters unchanged, setting a series of injection rates, and analyzing the CO in the exhausted gas reservoir 2 Variation of injection rate to depleted gas reservoir CO 2 And (3) influence of the sequestration performance, and the influence degree of the injection rate on the sequestration performance is determined.
Considering the influence of the initial recovery ratio, keeping other parameters unchanged, setting a series of initial recovery ratios, and analyzing the change of the initial recovery ratio of the exhausted gas reservoir on the CO of the exhausted gas reservoir 2 And (3) influence of the sequestration performance, and the influence degree of the initial recovery on the sequestration performance is determined.
Considering the influence of the critical concentration of the impurity gas in the produced gas, keeping other parameters unchanged, setting a series of critical concentrations of the impurity gas, and analyzing the change of the critical concentrations of the impurity gas on the CO in the exhausted gas reservoir 2 The influence of the sealing performance is used for determining the influence degree of the critical concentration of the impurity gas on the sealing performance.
(5) By comparing the simulation calculation results, the CO injection of different injection rates, initial recovery ratios and critical concentrations of impurity gases in the produced gas to the exhausted gas reservoir is respectively determined 2 Analyzing the influence degree of each factor on improving the carbon sequestration performance of the exhausted gas reservoir;
(6) from the analysis results, it was confirmed that CO contained impurities 2 And improving the recovery ratio of the exhausted gas reservoir.
The injection rate will be used as an example to affect the CO injection into the depleted gas reservoir 2 Analysis of factors for sequestration Performance by comparison of CO 2 The sealing stock, the mole fraction of the reservoir gas, the injection engineering period and the comprehensive index are used for giving the influence degree of the injection rate。
The embodiment is as follows: [ design of injection Rate ]
For depleted gas reservoirs with a certain initial recovery factor (80%). FIG. 1 shows CO of CSEGR at different injection rates 2 Amount of occlusion, it can be seen from FIG. 1 that as the injection rate of the four injected gases increases, CO is injected during EGR 2 The amount of sequestration increases, CO during CCS 2 The amount of sequestration is reduced. Pure CO in EGR process at injection rate of 4kg/s 2 、96％CO 2 、85％CO 2 、75％ CO2 CO corresponding to these four gases 2 The sealed amount is 1.15, 1.11, 0.97 and 0.88Mt respectively, and CO is carried out after the purging is finished 2 The amount of sequestration during sequestration was 1.91, 1.83, 1.59, and 1.35Mt, respectively, indicating that for a given injection rate, the amount of sequestration of CO2 during EGR decreases as the impurity concentration increases.
For pure CO 2 For example, the injection rates of 2kg/s, 4kg/s and 8kg/s correspond to the sequestration amounts of 3.08Mt, 3.06Mt and 3.03Mt, respectively;
for 96% CO 2 +1％N 2 +1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 For example, the injection rates of 2kg/s, 4kg/s and 8kg/s correspond to the sequestration amounts of 2.96Mt, 2.94Mt and 2.92Mt, respectively;
for 85% CO 2 +10％N 2 +2％O 2 +1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 For example, the injection rates of 2kg/s, 4kg/s and 8kg/s correspond to the sequestration amounts of 2.58Mt, 2.56Mt and 2.55Mt, respectively;
for 75% CO 2 +15％N 2 +3％O 2 +4％H 2 O+1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 For example, the injection rates of 2kg/s, 4kg/s, and 8kg/s correspond to the amount of sequestration of 2.22Mt, 2.23Mt, and 2.51Mt, respectively. It can be seen that regardless of the composition of the injected gas, the total sequestered amount decreases only slightly as the injection rate increases.
FIG. 2 is a graph of CO in reservoir gas for CSEGR at different injection rates 2 As can be seen from fig. 2, the injection rate has little effect on the mole fraction of the gas of the different components in the reservoir. Need toNote that the reservoir gas is CO 2 Is lower than the CO in the injected gas 2 Due to natural gas in the reservoir, so that CO is present in the gas phase 2 The concentration of (A) is reduced.
For pure CO 2 In other words, the injection rates of 2kg/s, 4kg/s and 8kg/s correspond to the CO in the gas phase of the reservoir after the gas is driven off and sealed 2 The mole fractions are respectively 0.901, 0.898 and 0.893;
for 96% CO 2 +1％N 2 +1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 For example, the injection rates of CO in the gas phase of the gas reservoir are 2kg/s, 4kg/s and 8kg/s 2 The mole fractions are respectively 0.840, 0.837 and 0.832;
for 85% CO 2 +10％N 2 +2％O 2 +1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 For example, the injection rates of CO in the gas phase of the gas reservoir are 2kg/s, 4kg/s and 8kg/s 2 The mole fractions are respectively 0.764, 0.760 and 0.757;
for 75% CO 2 +15％N 2 +3％O 2 +4％H 2 O+1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 For example, the injection rates of CO in the gas phase of the gas reservoir are 2kg/s, 4kg/s and 8kg/s 2 The mole fractions are 0.673, 0.668 and 0.665, respectively.
It can be seen that for a certain concentration of CO 2 In other words, the injection rate is relative to the CO in the reservoir after purging and sequestration 2 The influence of the mole fraction of (c) is not significant.
FIG. 3 shows the engineering period of CSEGR at different injection rates, and from FIG. 3 it can be seen that as the injection rate increases, the engineering period is significantly shortened, with the main effect being CO 2 The EGR time of (2) is shortened by 12.5 years to 5.3 years. The engineering periods for the four gases at the low injection rate (2kg/s) were 19.6, 18.4, 16.8 and 14.0 years respectively, and the high injection rate (8kg/s) was 7.0, 9.5, 8.1 and 5.6 years respectively. It was found that CO was carried out at a high injection rate (8kg/s) 2 The gas purging and sealing can significantly shorten the construction period.
FIG. 4 shows different injection ratesThe overall index of CSEGR, as seen by comparison in FIG. 4, for CO containing different concentrations of impurities 2 The schemes with the injection rate of 8kg/s all have the maximum comprehensive index value, which indicates that the exhausted gas reservoir injects CO 2 The advantage of using a high injection rate in the scheme. Therefore, it is recommended to inject CO into the depleted gas reservoir 2 A higher injection rate (8kg/s) was used.
Claims (8)
1. CO containing multiple impurities 2 The method for improving the recovery ratio of the exhausted gas reservoir and effectively sealing the exhausted gas reservoir is characterized by comprising the following steps of:
(1) selecting CO containing impurity gas with certain concentration 2 The concentration of impurity gas is divided into high, low and medium concentrations;
(2) CO with multiple impurities calculated using SRK equation of state 2 A phase complex line of the gas is used for determining the phase change characteristics;
in the formula: p is system pressure, Pa; r is an ideal gas constant, 8.314J/(mol.K); t is the system temperature, K; v is the system molar volume, m 3 Per mol; a and b are state equation coefficients;
(3) establishing a depleted gas reservoir model, and acquiring production history data of the gas reservoir;
(4) injecting CO into exhausted gas reservoir under different parameter conditions by using numerical simulation technology 2 Performing analog calculation on all factors of the encapsulation performance; CO injection in exhausted gas reservoirs 2 Various factors of the sealing performance include CO 2 Inventory, gas mole fraction in the gas reservoir, CO 2 Sealing and storing the construction period;
(5) by comparing the simulation calculation results, the CO injection of different parameters to the exhausted gas reservoir is respectively determined 2 Analyzing the influence degree of each factor on improving the carbon sequestration performance of the exhausted gas reservoir;
(6) according to the analysis result, the measures and the directions for improving the recovery ratio of the exhausted gas reservoir by the CO2 containing the multiple impurities are determined.
2. The multi-impurity CO of claim 1 2 The method for improving the recovery ratio of the exhausted gas reservoir and effectively sealing the exhausted gas reservoir is characterized in that CO with low, medium and high impurity concentrations in the step (1) 2 The gas comprises the following components in percentage by volume:
96％CO 2 +1％N 2 +1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 ；
85％CO 2 +10％N 2 +2％O 2 +1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 ；
75％CO 2 +15％N 2 +3％O 2 +4％H 2 O+1％Ar+1％H 2 +0.5％H 2 S+0.5％SO 2 。
3. CO containing multiple impurities according to claim 1 2 The method for improving the recovery efficiency and effectively sealing and storing the exhausted gas reservoir is characterized in that the establishment of the exhausted gas reservoir model in the step (3) comprises the steps of obtaining or calculating the length, the width and the height of the gas reservoir model, the porosity, the horizontal permeability and the vertical permeability of a reservoir stratum, the saturation of bound water and the injection and production mode of a well network.
4. The multi-impurity CO of claim 1 2 The method for improving the recovery ratio of the exhausted gas reservoir and effectively sealing the exhausted gas reservoir is characterized in that CO containing impurities is injected in the step (4) 2 Before, pure CO with the volume of 5-20% of impurity gas is injected 2 If CO of low impurity concentration is sealed 2 Gas, 5% pure CO is injected in advance 2 If CO is sequestered at impurity concentrations 2 Gas, 12% pure CO is injected in advance 2 If CO of high impurity concentration is sealed 2 Gas, 20% pure CO is injected in advance 2 。
5. The multi-impurity CO of claim 1 2 A method for improving the recovery ratio of a depleted gas reservoir and effectively sealing the depleted gas reservoir,the method is characterized in that the parameters in the step (4) comprise injection rate, initial recovery rate and critical concentration of impurity gas in the produced gas.
6. CO with multiple impurities according to claim 5 2 The method for improving the recovery ratio and effectively sealing up the exhausted gas reservoir is characterized in that the influence of different injection rates is considered in the step (4), other parameters are kept unchanged, a series of injection rates are set, and the CO in the exhausted gas reservoir is analyzed 2 Variation of injection rate to depleted gas reservoir CO 2 And (3) influence of the sequestration performance, and the influence degree of the injection rate on the sequestration performance is determined.
7. CO with multiple impurities according to claim 5 2 The method for improving the recovery ratio and effectively sealing the depleted gas reservoir is characterized in that the influence of the initial recovery ratio is considered in the step (4), other parameters are kept unchanged, a series of initial recovery ratios are set, and the change of the initial recovery ratio of the depleted gas reservoir on the CO of the depleted gas reservoir is analyzed 2 And (3) influence of the sequestration performance, and the influence degree of the initial recovery on the sequestration performance is determined.
8. CO with multiple impurities according to claim 5 2 The method for improving the recovery ratio and effectively sealing the exhausted gas reservoir is characterized in that the influence of the critical concentration of the impurity gas in the produced gas is considered in the step (4), other parameters are kept unchanged, a series of critical concentrations of the impurity gas are set, and the change of the critical concentration of the impurity gas on the CO in the exhausted gas reservoir is analyzed 2 The influence of the sealing performance is used for determining the influence degree of the critical concentration of the impurity gas on the sealing performance.
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